Sildenafil is the main component of Cenforce 150 tablets, and you should take them 20 to 30 minutes before having sex. Take this tablet more than once in a 24-hour period if you want to reap the greatest benefits from it. Don'ts: Sildenafil from Cenforce 150 can take up to six hours to take effect.see Cenforce 150 reviews and then you can used it.